Open-hearth furnace and the like



E9 E3. F. oRTH OPEN HEARTH FURNACE AND THE LIKE Original F'iled Feb. 7, 1921 IUI Patented July 1, 1930 UNITED STATES PATENT OFFICE FBANK ORTH, OF INDIANA HARBOR, INDIANA, ASSIGNOR, BY MESNE ASSIGNMENTS, T OPEN' HEARTH COMBUSTION OOMPANY, A CORPORATION OIF NEW JERSEY OPEN-HEABTH FURNACE .AND THE LIKE Original application filed February 7, 1921, Serial No. 443,065. Divided and this application led September 6, 1924.

This invention relates to certain improvements in open hearth furnaces and the llke. This invention has reference particularly to l certain improvements in Vthe construction of an open hearth furnace whereby the flame and consequent heating action within the furnace are effectively controlled. y

This application is a division of my copending application for' Letters Patent of the United States on improvements in open hearth fur'naces and method of heat generation, Serial No. 443,065, which was filed February 7, 1921, and is still pending.

The present application has reference parl ticularly to the general form and arrangement of the dampers at the ends of the bath for controlling the movement of the flame and gases. The present application relates particularly to a construction wherein the dampers are slidably mounted at the sides of the ports at the ends of the bath, so that they may be adjusted back and forth in a horizontal direction. l

One ofthe objects of the present invention is to provide an improved form and arrangement of ports for introducing the burning mixture to the bath, in combination with the laterally moving dampers, the arrangement being such that a very greatl improved mixture of fuel and air is broug t about with an improved economy of operation, a higher possible temperature and a much better control of the operating conditions within the furnace.

Other obj ccts and uses of the invention will- Serial No. 736,246.

numeral 4. At each end the side walls and 6 are preferably drawn towards each other, as shown at 7, 8, 9 and 10, Vso as to establish contracted end portions at the ends of the bath. The openings 11 and 12 are formed .at the two ends respectively, and centrally with` respect to the contracted end portions.

Behind the ports 11 and 12, respectively, there are provided suitable conections for the introduction of air and gas for combustion on one half of each cycle, and for the removal of products of ,combustion on the other half of each cycle. Air and gas regener'ators 13 and 14, and 15 and 16, respectively, are provided for the ends of the furnace, and suitable connections and dampers are established for controlling the delivery of theair and gas to each end or for the removal of products of combustion from each end depending on the cylic operation of the furnace. It is not deemed necessary to describe these in detail in the present application, since they are fully set forth in the original application of which this is a division, and since they do not constitute any particular portion of the present divisional invention.

The openings 11 and 12 are preferably of substantially full height as indicated in Fig. 3, so that when fully exposed they present large and ample openings for the flow of the gases or products of combustion. At the sides of the opening 11 are provided horizontally movable dampers 17 and 18 and at the sides of the opening 12 are provided the horizontally movable dampers 19 and 20. These dampers may be moved towards and from each other in pairs to effectively and symmetrically control the exposure of opening at their respect-ive ends of the furnace. In this way, the gas streams can be effectively controlled as respects their size and also as respects the manner in which they act upon the material lying within the bath. Ordinarily, the dampers at the outgoing opening wi l be fully opened so as to give a full opening at that end, whereas the dampers at the inlet opening will be simultaneously adjusted to that position which will give the most effective control and the best operation.

When the direction of fiow through the bath is reversed, the respective pairs of dampers will be correspondingly readjusted so as to again provide the desired conditions of operation.

It will be observed that in the const-ruction illustrated in the drawing, the end portions of the bath are drawn towards each other on an angle of substantially with respect to the axis of the furnace; and it will also be observed that the roof portions at the ends of the furnace are also drawn down towards the openings 11 and 12 on a similar angle, `as shown at 21 in Fig. 2. It is also observed that behind each of the openings 11 and 12, the structure is so formed as to present a relatively enlarged chamber having its side walls adjacent to the opening formed on a similar angle. In this way each of the openings 11 and 12 resembles in construction and function a Venturi throat with the consequent benefits and advantages of operation.

In the particular construction illustrated, there is a central gas port 22 in the lower portion of the chamber behind each of the openings 11 and 12, which gas port communicates directly with a cutaway opening 23 of the horizontal partition 24 so as to allow the delivery of gas towards the opening 11 or 12, as the case may be, in the form of a central tongue. There is also provided a pair of air ports 25 and 26 at the sides of the gas port, which air ports deliver the air for combustion above the partition 24: and thus at the point which is most advantageous to heat the gas and produce combustion as the gas and air travel towards and through .the opening 11 or 12, as the case may be.

While I have herein shown and described only a single embodiment of the features of my present invention, still I do not limit myse f to the same, except as I may do so in the claims.

I claim:

1. In a metallurgical furnace, air and gas ports in each end of the furnace, the furnace walls inclining inwardly between the port ends and the hearth to form a reduced combined port for air and gas, and means for selectively reducing the area of said combined port.

2. In a metallurgical furnace, air and gas ports in each end of the furnace, the furnace walls inclining inwardly between the port ends and the hearth to form a reduced com'- bined port for air and gas, and movable dampers for selectively reducing the area of said combined port.

3. In a metallurgical furnace, air and gas ports in each end of the furnace, the furnace walls inclining inwardly between the port ends and the hearth to form a reduced combined port for air and gas, and oppositely placed dampers movable ,through the side walls for selectively reducing the area 0I said combined port.

4. In a metallurgical furnace, air and gas ports in each end of the furnace, the furnace walls inclining inwardly between the port ends and the hearth to form a Venturi throat the smallest portion 'of which serves as a reduced combined port for air and gas, and means for selectively reducing the area of said combined port.

5. In a metallurgical furnace, an end construction comprising a central gas port, laterally placed air ports discharging above the gras port, inwardly inclined Walls forming a enturi throat between the ports and the furnace chamber, and means for controlling the effective area of the Venturi throat.

6. In a metallurgical furnace, an end construction comprising a central gas port, laterally placed air ports discharging above the gas port, inwardly inclined walls forming a Venturi throat between the ports and the furnace chamber, and movable dampers for controlling the effective area of the Venturi throat.

7. In a metallurgical furnace, an end construction comprising a central gas port, lat-- erally placed air ports discharging above the gas port, inwardly inclined walls forming a Venturi throat between the ports and the furnace chamber, and oppositely placed dampers movable laterally through the side walls for controlling the effective area of the narrowest port of the Venturi throat.

FRANK ORTH. 

